CHEMOSPHERE
·
2019
·
IF 5.108
Guangshan Zhang,Yanei Xue,Qiao Wang,Peng Wang,Hong Yao,Wen Zhang,Jinbo Zhao,Yang Li
Norfloxacin (NOR) is an emerging antibiotics contaminant due to its high resistance to microbial degradation and natural weathering. In this study, Fe-doped ZnS photocatalyst (Zn 0.9 Fe 0.1 S) was deposited on nickel foam (Ni-foam) to improve photocatalytic activity under visible light irradiation. The mass ratio of Zn 0.9 Fe 0.1 S and Ni-foam was optimized to be 0.03 g catalyst versus per g Ni-foam (0.03 Zn 0.9 Fe 0.1 S/Ni-foam), which led to the highest removal rate of 95%. The optimal degradation condition for NOR over 0.03 Zn 0.9 Fe 0.1 S/Ni-foam was pH at 7.0, initial NOR concentration of 5 mg L −1 , and initial photocatalyst concentration of 11.7 g L −1 , with the highest first-order reaction rate constant of 0.025 min −1 and mineralization rate of 63.1%. The NOR removal rate on 0.03 Zn 0.9 Fe 0.1 S/Ni-foam photocatalyst (95%) was approximately four times of that obtained on Zn 0.9 Fe 0.1 S photocatalyst (25%). The increased photocatalytic performance could be attributed to the function of Ni-foam as excellent electron collectors that provided efficient photoinduced charge separation from Zn 0.9 Fe 0.1 S. The reactive species responsible for the degradation of NOR were photo-generated holes, hydroxyl radical , and superoxide radicals. Nearly 90% of the photocatalytic efficiency was retained over seven cycles and the released metal ion concentrations were <0.3% of the total mass of photocatalyst, suggesting high stability of the photocatalyst during the photocatalytic reactions. The aqueous/solid mass transfer and intraparticle mass transfer for Zn 0.9 Fe 0.1 S/Ni-foam were not limiting factors for the degradation of NOR. Therefore the Zn 0.9 Fe 0.1 S/Ni-foam photocatalyst could be applied in the degradation of hazardous pollutants .
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yue Du,Guangxing Pan,Li Wang,Yonghai Song
Here, a series of low-cost Co x Ni y P nanoparticles embedded in N-doped porous carbon stood up on Ni foam nanocomposites (Co x Ni y P@NC/NF) were prepared as efficient catalysts for hydrogen evolution reaction (HER) by a low temperature hydrothermal and phosphating method. Characterization of various techniques indicated the Co x Ni y P nanoparticles with about 5 nm in diameter were uniformly embedded in NC to form Co x Ni y P@NC nanosheets with thickness of 20–400 nm. The NC was composed of graphene and the Co x Ni y P@NC nanosheets stood up on NF in crisscross fashion. The electrochemical results showed that the Co x Ni y P@NC/NF nanocomposites showed high catalytic activity for HER in alkaline solution and its catalytic activity depended on the ratio of Co:Ni. At the ratio of Co:Ni of 4:1, the Co 4 NiP@NC/NF presented best HER performances with the overpotential of 70 mV at 10 mA cm −1 , better than commercialized Pt. The Co 4 NiP@NC/NF also displayed a wonderful Faraday efficiency of 95%, suggesting that it could effectively convert electrical energy into chemical energy in HER. The catalytic activity of Co 4 NiP@NC/NF remained unchanged in 35 h, indicating the Co 4 NiP@NC/NF possessed good stability. The excellent HER performances might make it be a substitute for precious metal catalysts for hydrogen production.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2013
·Vol. 113
·期 3
·683-692
·
IF 1.545
Luo Chenghao,Lu Weili,Li Yu,Feng Yiyu,Feng Wei,Zhao Yunhui,Yuan Xiaoyan
Carbon nanofibers (CNFs) embedded with various amounts of Ni and NiO nanoparticles (C/Ni–NiO) were prepared by electrospinning of polyacrylonitrile (PAN), followed by heat treatment. The structure and composition of the obtained C/Ni–NiO composite nanofibers were analyzed by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The results suggested that the morphology, nanofiber diameter, and the content of the Ni–NiO nanoparticles in the CNFs were controlled by different amounts of nickel acetate added into the PAN. The electrochemical measurements of a charge/discharge experiment and a cyclic voltammetry test indicated that the content and the size of Ni–NiO nanoparticles embedded in the CNFs had a great influence on the electrochemical performance of lithium-ion batteries. CNFs embedded with a certain content of Ni–NiO nanoparticles as binder-free anodes for rechargeable lithium-ion batteries exhibited improved electrochemical performance, including high reversible capacities, good capacity retention, and stable cycling performance. This is mainly ascribed to the formation of a well-distributed Ni–NiO nanoparticle structure and the buffering role of the carbon nanofiber matrix, together with the high theoretical capacity of NiO and the increase in electrode connectivity caused by the formation of electrochemically inactive Ni nanoparticles.
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高影响因子
DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 21
·7924-7929
·
IF 4.097
Linyi Zhou,Ming Wen,Qingsheng Wu,Dandan Wu
Magnetic FeNi@Ni nanocables were prepared as a superior recyclable catalyst towards the hydrogenation reduction of p-nitrophenol to p-aminophenol through a two-step tunable assembly process in a solvothermal system. The proposed fabrication mechanism was verified through characterization by SEM, TEM, XRD, XPS, and UV-Vis. The as-prepared FeNi@Ni nanocomposites are core–shell-structured nanocables with Ni nanoparticles (NPs) attached on FeNi nanorods (NRs) surface loosely. The catalytic reactivity monitored by means of a UV-vis dynamic process shows FeNi@Ni nanocables can catalyse the transformation of p-nitrophenol to p-aminophenol completely under an ambient atmosphere at room temperature, and enable the catalysis to be more efficient than its counterparts FeNi NRs and Ni NPs due to the interfacial synergistic effect. Additionally, the resultant hierarchical metal–alloy nanocomposites possess ferromagnetic behaviour, and can be easily separated and recycled by an external magnet field for application.
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高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Mingshu Xiao,Rui Cheng,Meifeng Hao,Mao Zhou,Yuqing Miao
Here, the ultrathin Ni nanofilms loading ultrafine Pt nanoparticles (Ni/Pt nanocomposites) were synthesized by a simple substitution method for the electrocatalysis of hydrogen evolution reaction (HER). First, the ultrathin Ni nanofilms were prepared by using NaBH4 to reduce Ni salt. Then the ultrafine Pt nanoparticles attached on the surface of the ultrathin Ni nanofilms through the onsite substitution reaction between PtCl62– and Ni element. X-ray photoelectron spectroscopy (XPS) experiment confirmed that Ni in Ni/Pt nanocomposites exists in the form of Ni(OH)2. Transmission electro microscope (TEM) study showed that the ultrafine Pt nanoparticles were sufficiently dispersed and loaded at Ni ultrathin nanofilms. The obtained Ni/Pt nanocomposites exhibited superior activity of HER and good stability in acidic media. It obtained 10 and 100 mA/cm2 with overpotential of only 36 and 115 mV, respectively. The stability experiment of 20 000 s gave nearly negligible current decrease. On the one hand, the ultrathin Ni nanofilms help to disperse and form the ultrafine Pt nanoparticles. On the other hand, the ultrathin Ni nanofilms help to load the ultrafine Pt nanoparticles as catalyst support and immobilize both of them onto the electrode surface because of the high surface free energy of ultrathin nanofilm and the leading high adsorption ability. In addition, Ni itself exhibited somewhat electrocatalytic activity of HER, which contributed to the whole HER electrocatalysis of Ni/Pt nanocomposites. The excellent electrocatalysis may lead to the decreased consumption of expensive Pt and open up new opportunities for applications in hydrogen energy.
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 93
·51184-51193
·
IF 3.708
Qing Zhang,Tao Wu,Peng Zhang,Ruijuan Qi,Rong Huang,Xuefeng Song,Lian Gao
Hydrogen reduction of hierarchical spinel intermediates that were synthesized by a facile hydrothermal method results in Ni/γ-Al2O3 nanocomposites with Ni nanoparticles (∼5.5 nm) well dispersed and embedded in nanoflakes of the hollow Al2O3 microspheres. The good dispersion of small metal nanoparticles and strong metal–support interactions that resulted from decomposition of spinel intermediates during reduction are essential for the efficient and sustainable high temperature dry reforming of methane (DRM) catalysis. The high surface area (170 m2 g−1) composite catalysts show coke and sintering resistance in long term DRM catalysis at 750 °C, the highest temperature ever tested for hierarchical nanostructures. Ni loadings and the calcination temperatures of the spinel intermediate are investigated for their effect on the morphology and the catalytic performance of the final catalysts. It is interesting that some initially non-active control catalysts can be activated during long term testing.
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ENERGY CONVERSION AND MANAGEMENT
·
2015
·
IF 4.38
Jinxing Long,Shiyang Shu,Qingyun Wu,Zhengqiu Yuan,Tiejun Wang,Ying Xu,Xinghua Zhang,Qi Zhang,Longlong Ma
Selective production of cyclohexanol from renewable lignin derived phenolic has been presented using the cost-efficient catalyst Ni/MgO which shows excellent catalytic activity in the hydrogenation reaction and dehydroxylation inhibition. Guaiacol, one of the most abundant lignin depolymerization products, was selected as the model compound. The hydrogenation performance of guaiacol was investigated over various catalysts. The effect of the reaction parameters was also studied. The results showed that guaiacol could be efficiently converted to cyclohexanol, which is a highly value-added precursor and additive for bio-fuel that is generally obtained from unsustainable fossil resources. Under the mild condition (160 °C, 3 h and 3 MPa H 2 ), more than 97.74% of guaiacol conversion with 100% cyclohexanol selectivity can be achieved in the presence of 20% Ni/MgO. Intensive catalyst characterization demonstrated that the efficient promotion effect of the base carrier for the Ni active center was responsible for efficient guaiacol conversion and selective cyclohexanol production. Furthermore, the Ni/MgO catalyst showed excellent recyclability, where no significant activity loss was observed even after four runs. Moreover, the reaction pathway and the catalytic mechanism are proposed.
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高影响因子
ELECTROANALYSIS
·
2016
·Vol. 29
·期 4
·965-974
·
IF 2.471
Yingqiao He,Guodong Wei,Junhong Lin,Mingxu Sun,Ziheng Li
A novel non-enzymatic carbohydrates sensor which was an indium tin oxide (ITO) glass electrode modified by nickel and copper nanoparticles (Cu/Ni/ITO) was developed by an electrochemical method. The crystallinity, morphology, electrochemical measurements and amperometric response of the as-prepared ITO modified electrode were examined by the X-ray diffraction (XRD), scanning electron microscopic (SEM), cyclic voltammetry (CV) and chronoamperometry, respectively. The Cu/Ni/ITO electrode had better electroactivity for glucose oxidation than that obtained using Cu/ITO, Ni/ITO, and Ni/Cu/ITO. The logistic regression equation, I pa = ( A 1 – A 2 )/[1 + ( C glucose / x 0 ) p ] + A 2 , was used to fit the calibration curves of glucose aqueous solution concentrations and responsive current intensity. In research of other saccharides, such as fructose, lactose, sucrose, and maltose, which were detected by the Cu/Ni/ITO electrode, it was obvious that the Cu/Ni/ITO electrode was more sensitive to monosaccharides than disaccharides. Monosaccharides and disaccharides can be detected because the saccharides themselves had aldehyde group or be isomerized to an isomer having an aldehyde group in alkaline environment, and then aldehyde group produced carboxylic acid in the catalytic oxidation of the electrode, which lead to the change of electrode surface conductivity and the appearance of oxidation peak, and the alkaline environment further promotes the above reaction.
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Frontiers of Chemical Science and Engineering
·
2017
·Vol. 11
·期 4
·613-623
·
IF 1.712
Tang Honggui,Li Shuangshuang,Gong Dandan,Guan Yi,Liu Yuan
Carbon deposition and sintering of active components such as nano particles are great challenges for Ni-based catalysts for CO methanation to generate synthetic natural gas from syngas. Facing the challenges, bimetallic catalysts with different Fe content derived from layered double hydroxide containing Ni, Fe, Mg, Al elements were prepared by co-precipitation method. Nanoparticles of Ni-Fe alloy were supported on mixed oxides of aluminium and magnesium after calcination and reduction. The catalysts were characterized by Brunner-Emmett-Teller (BET), X-ray diffraction, hydrogen temperature programmed reduction, inductively coupled plasma, X-ray photoelectron spectroscopy, transmission electron microscopy and thermogravimetric techniques, and their catalytic activity for CO methanation was investigated. The results show that the Ni-Fe alloy catalysts exhibit better catalytic performance than monometallic catalysts except for the Ni4Fe-red catalyst. The Ni2Fe-red catalyst shows the highest CO conversion (100% at 260–350 °C), as well as the highest CH 4 selectivity (over 95% at 280–350 °C), owing to the formation of Ni-Fe alloy. In stability test, the Ni2Fe-red catalyst exhibits great improvement in both anti-sintering and resistance to carbon formation compared with the Ni0Fe-red catalyst. The strong interaction between Ni and Fe element in alloy and surface distribution of Fe element not only inhibits the sintering of nanoparticles but restrains the formation of Ni clusters.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2017
·Vol. 228
·期 11
·1-15
·
IF 1.702
Zhao Chuanliang,Zheng Huaili,Sun Yongjun,Liu Bingzhi,Zhou Yuhao,Liu Yongzhi,Zheng Xinyu
Modified natural biosorbents have been the research hot spot in wastewater treatment field. Natural polyphenol compounds, tannins with many functional groups can be easily modified to produce biosorbents. This work presents an environmentally friendly tannin-based dithiocarbamate (TDTC) with enhanced function of adsorption. TDTC was successfully synthesized by a two-step method involving Mannich reaction and esterification. The structure and synthetic mechanisms of TDTC were discussed through instrumental analysis. The BET-specific surface area analysis results showed that TDTC exhibited a mesoporous structure with an increased surface area. Parameters affecting adsorption such as initial pH, adsorbent dosage, contact time, initial concentration, and temperature were systematically examined. Results showed that the maximum adsorption capacity toward Ni(II) of TDTC was 112.49 mg/g. In addition, TDTC exhibited a fast adsorption rate and 80% of the Ni(II) was removed within just 20 min. The adsorption kinetics and adsorption isotherm were well described by the pseudo-second-order model and Langmuir model, respectively. Moreover, TDTC could be easily regenerated without obvious loss of adsorption capability after five adsorption–desorption cycles. All these results indicate that TDTC is an ideal candidate for the efficient removal of Ni(II).
Removal of Ni(II) from water using environmental-friendly tannin-based dithiocarbamate biosorbents.
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Coatings
·
2017
·Vol. 7
·期 1
·16
·
IF 2.175
Hejie Yang,Yimin Gao,Weichao Qin
The corrosion behavior of Ni-P coating deposited on 3003 aluminum alloy in flue gas condensate was investigated by electrochemical approaches. The results indicated that nitrite acted as a corrosion inhibitor. The inhibiting effect of nitrite was reduced in solutions containing sulfate or nitrate. Chloride and sulfate accelerated the corrosion of Ni-P coatings greatly. This can provide important information for the researchers to develop special Ni-P coatings with high corrosion resistance in the flue gas condensate.Keywords:electroless Ni-P coating;anion;3003 aluminum alloy;flue gas condensate;pitting corrosion
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高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Yijin Shu,Sina He,Lifang Xie,Hang Cheong Chan,Xiang Yu,Lichun Yang,Qingsheng Gao
The hydrogenation of nitroarenes to value-added aromatic amines requires active and selective catalysts. Due to the good efficiency, economic cost and high earth-abundance, Ni-based nanostructures emerge as the promising catalysts, which are however limited by the poor dispersion and unsatisfied durability. Herein, Mo 2 C nanowires was introduced as a versatile support towards the highly dispersive Ni owing to the strong metal-support interactions on carbide surface, accomplishing the high activity in the hydrogenation of 3-nitrobenzoic acid, 4-nitrobenzoic acid and nitrobenzene. However, the presence of water that promoted the selective hydrogenation unfortunately deactivated Ni species. An effective carbon coating was further introduced to remarkably enhance the stability, protecting active Ni from corrosive H + and H 2 O. This work elucidates a feasible way towards efficient and stable catalysts by the introduction of both carbide supports and carbon coating, shedding some light on the development of high-performance catalysts.
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